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【正文】 rated capacity. UG136(b) Material Selections UG136(b) (1) Cast iron seats and disks are not permitted. UG136(b) (2) Adjacent sliding surfaces such as guides and disks or disk holders shall both be of corrosion resistant material. Springs of corrosion resistant material or having a corrosion resistant coating are required. The seats and disks of pressure relief valves shall be of suitable material to resist corrosion by the ?uid to be contained. NOTE: The degree of corrosion resistance, appropriate to the intended service, shall be a matter of agreement between the manufacturer and The purchaser. UG136(b)(3) Materials used in bodies and bons or yokes shall be listed in Section II and this and low alloy steel bodies, 3 bons, yokes and bolting (UG20) subject to inservice temperatures colder than ?20176。 F(?30176。 C) shall meet the requirements of UCS66, unless exempted by the following. (a) The coincident ratio de?ned in Fig. is or less. (b) The material(s) is exempted from impact testing per Fig. UCS66. UG136(b) (4) Materials used in nozzles, disks, and other parts contained within the external structure of the pressure relief valves shall be one of the following categories: (a) Listed in Section II。 (b) listed in ASTM speci?cations。 (c) Controlled by the Manufacturer of the pressure relief valve by a speci?cation ensuring control of chemical and physical properties and quality at least equivalent to ASTM standards. UG136(c) Inspection of Manufacturing and/or Assembly of Pressure Relief Valves UG136(c)(1) A Manufacturer or Assembler shall demonstrate to the satisfaction of a representative from an ASME designated anization that his manufacturing, production, and testing facilities and quality control procedures will insure close agreement between the performance of random production samples and the performance of those valves submitted for Capacity Certi?cation. UG136(c) (2) Manufacturing, assembly, inspection, and test operations including capacity are subject to inspections at any time by a representative from an ASME designated anization. UG136(c) (3) A Manufacturer or Assembler may be granted permission to apply the UV Code Symbol to production pressure relief valves capacity certi?ed in accordance with UG131 provided the following tests are Successfully pleted. This permission shall expire on the ?fth anniversary of the date it is initially granted. The permission may be extended for 5 year periods if the following tests are successfully repeated within the 6month period before expiration. (a) Two sample production pressure relief valves of a size and capacity within the capability of an ASME accepted laboratory shall be selected by a representative from an ASME designated anization. 4 (b) Operational and capacity tests shall be conducted in the presence of a representative from an ASME designated anization at an ASME accepted laboratory. The pressure relief valve Manufacturer or Assembler shall be noticed of the time of the test and may have representatives present to witness the test. Pressure relief valves having an adjustable blow down construction shall be adjusted by the Manufacturer or Assembler following successful testing for operation but prior to ?ow testing so that the blow down does not exceed 7% of the set pressure or 3 psi (20 kPa), whichever is greater. This adjustment may be made on the ?ow test facility. (c) Should any pressure relief valve fail to relieve at or above its certi?ed capacity or should it fail to meet performance requirements of this Division, the test shall be repeated at the rate of two replacement pressure relief valves, selected in accordance with (c)(3)(a) above, for Each pressure relief valve that failed. (d) Failure of any of the replacement pressure relief valves to meet the capacity or the performance requirements of this Division shall be cause for revocation within 60 days of the authorization to use the Code Symbo
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